I am unsure if I have the right size breast shield for my pump. At first I thought it was too small but after reading some stuff on getting the right fit I think it may be too big. Im confused! After pumping for a little bit my nipple gets HUGE, part of it is rubbing against the round tube part.. but I think it may be more of the areola thats rubbing. May sound silly, but it seems hard to tell bc it sucks my nipple into this monsterous size. My nipples turn white and deep purple after pumping and also are continuosly cracked, no matter what i do/put on them. I feel silly for not being able to figure it out after reading directions on how to find the right size, but im still a little unsure.